CVE-2026-48750
Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.
Fixes and workarounds
Fix
github.com/lxc/incus/v7/cmd/incusd (Go): OSV reports a fixed version 7.2.0. Check the advisory for supported release branches.
Source: OSV GHSA-73hr-m85f-64v9Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| incus lxc |
< 7.2.0 (affected) | CNA: GitHub_M |
github.com/lxc/incus/v7/cmd/incusdgithub.com/lxc/incus/v7/cmd/incusd
Go |
≥ 0; < 7.2.0 (affected, semver); OSV events: introduced 0; fixed 7.2.0Source events (semver)Other versions: unaffected |
OSV GHSA-73hr-m85f-64v9 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 9.9 critical |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | CNA: GitHub_M |
Exploit evidence
- https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9
exploit · ADP: CISA-ADP
References
- https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/canonical/lxd/security/advisories/GHSA-9j25-mm2h-2f76CNA: GitHub_M · x_refsource_MISC
- https://github.com/lxc/incus/security/advisories/GHSA-73hr-m85f-64v9ADP: CISA-ADP · exploit
- https://github.com/advisories/GHSA-73hr-m85f-64v9OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-73hr-m85f-64v9OSV / GitHub Security Advisories · osv
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